Electrical Supplies
TAD Footswitch Momentary SPST
TAD Footswitch Momentary SPST, Footswitch with 2 Solder Terminals, Key function: push-on/release-off, Installation diameter: 12 mm
https://www.bizrate.co.uk/electricalsupplies/tad-footswitch-momentary-spst-oid4547149990.html